express-nobots/lib/middleware.js

Keep Bots Away From Your Express App

var bots = require('./bots');
var regex = new RegExp('\\b' + bots.join('\\b|\\b') + '\\b', 'i');

module.exports = exports = function (options) {
    if (!options) {
        return blockBots;
    } else if (options.block) {
        return blockBots;
    } else if (!options.block) {
        return tagBots;
    }
};

var blockBots = function (req, res, next) {
    var ua = req.get('User-Agent');
    if (regex.test(ua)) return res.status(401).send("Halt! Who goes there? T'is a bot!");
    else return next();
};

var tagBots = function (req, res, next) {
    var ua = req.get('User-Agent');
    if (regex.test(ua)) req.isBot = true;
    else req.isBot = false;
    return next();
};